Lin Li Zehuan Huang Haoran Feng Gengxiong Zhuang Rui Chen Chunchao Guo Lu Sheng VoxHammer: Training-Free Precise and Coherent 3D Editing in Native 3D Space. 2025 August abs/2508.19247 CoRR https://doi.org/10.48550/arXiv.2508.19247 db/journals/corr/corr2508.html#abs-2508-19247 streams/journals/corr